Editor Quality Roadmap

This roadmap turns A3S Office from a broad editor demo into a dependable component product. Delivery is depth-first: finish the workflows users repeat every day, prove native-file compatibility, and only then expand the command surface.

The technical ownership model, Worker/WASM boundaries, and long-term engine stages remain defined in Browser editor architecture. This document owns product priority, quality gates, and the order in which capabilities are made release-ready.

Shared controlled IME integrity

Document, visual Markdown, and Presentation text now share one composition-aware controlled-state boundary. Pinyin and other pre-edit text stays editor-local; only the committed value is published, and an authoritative host replacement waits until composition settles. Ordinary typing takes no additional timer path. Focused component regressions plus a dedicated WebKit Playwright gate make this a permanent P0 text-entry contract.

Product Principles

Depth before breadth. A complete editing workflow is more valuable than another toolbar control without reliable import, undo, save, and export.
Word first. Document editing is the first quality track because it exercises layout, styles, tables, media, review, and long-document behavior together.
Native files are the acceptance test. A feature is not complete until its supported semantics survive import, edit, export, and reopen in Microsoft Office and Traditional Office.
Controlled state stays predictable. One user intent emits one host update and one undo record. External content replacement must not corrupt selection, history, or editor state.
Public APIs describe stable product contracts. Internal controllers are not exported merely to make an integration possible.
Documentation ships with the capability. Every public Prop, event, content field, and Extension boundary must be documented and tested.

Release Gates Shared by Every Editor

These are foundations, not a separate feature-expansion phase:

No browser-native prompt, confirm, context menu, or select control in a primary workflow.
Shared dialog, popover, menu, ribbon, status, save, loading, empty, and error states use the same placement and interaction rules.
Keyboard-only users can reach and leave every primary surface. Focus returns to the invoking control when a temporary surface closes.
React, Vue, and Web Component adapters expose the same supported behavior, with framework-specific names documented where they differ.
Controlled updates, undo, redo, import, export, and read-only preview have focused tests.
Desktop and compact visual checks cover normal, empty, loading, error, menu, dialog, and long-content states.
Performance budgets are fixture-based. A release cannot replace measured evidence with a qualitative claim.

Current shared-shell evidence includes one modal focus boundary for the compact Office sidebar, Presentation slide drawer, AI assistant, and editor dialogs. Each surface receives focus on entry, wraps forward and reverse Tab navigation, isolates obscured content with inert, lets only the top overlay handle Escape, and restores the current semantic invoker even when React remounts that control. The Office shell keeps persistent desktop navigation and the temporary compact drawer as separate states. Crossing into the compact breakpoint therefore closes the drawer in the same render without obscuring the workspace or moving its active focus, while returning to desktop restores the user's persistent sidebar preference. Compact Word navigation, find, layout, citations, changes, and comments task panes now use the same modal boundary while retaining persistent side-pane behavior on desktop. Phone, 768 px, and desktop browser checks keep overlay and persistent-pane behavior distinct. Shared Office color palettes now replace their dense desktop grid with eight larger columns on phones; spatial keyboard movement follows the rendered column count across theme and standard-color sections. Shared editor context menus remain pointer- or selection-anchored on desktop, but become safe-area-aware bottom action sheets below 640 px. Their actions are at least 44 px tall, long menus scroll inside a bounded surface, Escape returns focus to the editing target, and deterministic Spreadsheet evidence captures the phone layout, accessibility tree, console, and page errors. Shared Office select menus now keep their compact desktop density while using 44 px option rows and a taller viewport-bounded scroll region on phones. The deterministic Word font workflow traverses the complete grouped font list with End, applies the final option while returning focus to the document, and proves that Escape from a reopened picker restores the exact combobox trigger.

Priority 1: Word-Compatible Document Editing

Document work is delivered as complete vertical slices in the order below. New ribbon commands wait unless they are required by the current slice.

1. DOCX Round-Trip Foundation

Move package relationships, styles, numbering, themes, comments, headers, footers, notes, fields, and media toward loss-preserving browser state.
Preserve unsupported package parts and attributes instead of regenerating them from visible HTML.
Build small, reviewable fixtures for every supported semantic and include documents produced by both Microsoft Word and Traditional Office.
Report unsupported or normalized content explicitly before export.

The first package-state slice now registers the imported DOCX source Blob and retains safe source-only OPC parts byte-for-byte across an edited export. It merges content-type declarations and relationship graphs without overwriting generated core parts or reusing conflicting relationship IDs. Export fails closed when the declared source Blob is unavailable or its SHA-256 fingerprint does not match the imported package. Invalidated digital signatures and active VBA, ActiveX, or custom-ribbon parts are deliberately removed and reported. The second slice preserves relationship-free ignorable attributes, elements, and structurally valid, non-conflicting mc:AlternateContent blocks inside word/settings.xml, including strict/transitional and UTF-8/UTF-16 sources. Generated settings semantics stay authoritative. The relationship-identity slice reconnects source font-table metadata only to source-only internal obfuscated-font payloads, rewriting colliding relationship IDs and rejecting external, mistyped, duplicate, or payload-path-colliding references. Package XML decoding accepts strict or transitional UTF-8/UTF-16 input and emits UTF-8. The retained fonts remain native-DOCX state; browser edit, preview, and PDF surfaces continue to use registered fonts or substitution. The stable-identity slice now retains passive, relationship-free extension trees at the roots and uniquely matched nodes of word/styles.xml and word/numbering.xml. Style identity uses type plus style ID. Imported abstract-numbering, concrete-numbering, and level metadata follows regenerated IDs, while source-only, duplicate, malformed, and ambiguous one-to-many mappings fail closed. The drawing-identity slice additionally retains relationship-free passive extensions from non-OOXML ignorable namespaces on uniquely matched pictures in document, header, footer, footnote, and endnote parts. Normalized anchor plus drawing-property IDs survive sanitized body, page-chrome, and note HTML plus strict/transitional UTF-8/UTF-16 sources. Native note pictures retain layout, wrapping, crop, bounded rotation/reflection, and layer metadata through public import/export. Export repairs missing note-part image relationships, allocates collision-free IDs, and validates embedded media targets. Microsoft/OOXML semantic namespaces, source-only, changed, duplicate, namespace-spoofed, relationship-bound, and ambiguous drawings fail closed. Generated Word geometry and media remain authoritative; legacy VML, shapes, SmartArt, and drawing-bearing control wrappers normalize. Equivalent passive extensions now follow uniquely matched, unchanged paragraphs and their paragraph properties using native w14:paraId plus w14:textId. The identity survives sanitized body and page-chrome HTML. Text edits rotate the version ID, formatting-only edits and moves retain it, and copies or splits receive new paragraph IDs. Changed text versions, duplicate identities, relationship-bound content, and Microsoft/OOXML semantic branches fail closed; generated paragraph semantics remain authoritative. Stable table scopes now preserve equivalent passive extensions on w:tbl/w:tblPr, w:tr/w:trPr, and w:tc/w:tcPr. Rows retain native w14:paraId plus w14:textId; tables and cells derive conservative identities from directly owned row and paragraph IDs. Row text or structural edits rotate the version, formatting-only edits and moves retain it, copies receive independent IDs, and nested DOM collections no longer leak into outer-table export. Missing, duplicate, cross-kind, relationship-bound, and Microsoft/OOXML semantic identities fail closed while generated table semantics remain authoritative. Native positive footnote and endnote IDs now survive reorderings, while copies receive fresh IDs. Signed native comment and reply IDs retain thread parentage and resolved state. Relationship-free passive extensions follow uniquely matched w:footnote, w:endnote, w:comment, and w15:commentEx roots, and valid commentsIds durable IDs are rebound to regenerated final comment paragraphs. Duplicate, namespace-spoofed, deleted, relationship-bound, and unsupported modern reaction/people sidecars fail closed. Text-stable direct paragraphs and runs inside uniquely matched notes, comments, and replies now retain eligible passive extensions on paragraph, run, and run-property scopes. Safe unmodeled note properties survive, while unchanged plain-text comments recover relationship-free source run segmentation and formatting. Stable hyperlink wrappers retain safe tooltips, passive metadata, and eligible run formatting. Generated note destinations remain authoritative; unchanged comments and replies recover validated HTTP(S), mailto, or internal-anchor destinations, and external relationship IDs are deduplicated or rewritten after collisions. Text-stable static rich-text and plain-text content controls now recover eligible inline or contiguous block wrappers, aliases, tags, locking, signed IDs, Word 2013 appearance and color, end-character formatting, passive metadata, and stable runs. Footnote and endnote tables now remain native editable OOXML blocks instead of flattening each row into text. A rich-text block control can span stable paragraphs, tables, and nested tables when its row/cell shape, grid spans, merge state, nested block shape, and paragraph text match uniquely; generated geometry and supported formatting remain authoritative. Collisions rewrite only the affected control IDs. Text or table structure edits, duplicate text or properties, missing or malformed hyperlink relationships, wrong target types or modes, unsafe or relative targets, combined external-plus-anchor destinations, namespace spoofing, active bindings or placeholder state, form or nested controls, relationship-bound content, math, drawing-bearing control wrappers, and unsupported wrappers remain explicit fail-closed or normalization boundaries.

The body Writer surface now exposes a deliberately smaller editable slice on top of that package-preservation boundary: direct paragraph inline controls can be authored as plain text or rich text with aliases, tags, multiline state, appearance, color, and independent content or shell locks. Selection, preview, pagination, and Undo use the same inline node, and generic transactions cannot silently bypass a lock. Transitional and strict w:sdt import/export allocate collision-free native IDs and preserve supported run formatting. Data binding, placeholders, repeating regions, date/dropdown/picture/form controls, block or nested controls, and relationship-bound semantics remain explicit follow-up boundaries with compatibility diagnostics.

Exit evidence:

Import-edit-export-reopen passes in Word and Traditional Office for the declared fixture matrix.
Unedited supported files retain package relationships and unsupported parts.
A failed conversion does not overwrite the source file or emit a fidelity-success claim.

2. Deterministic Pagination and Text Layout

Resolve style inheritance, numbering, paragraph spacing, indents, tabs, bidirectional text, columns, section breaks, widow/orphan rules, and exact registered fonts before line layout.
Reflow from the earliest affected block and reuse stable earlier pages.
Keep page breaks as mapped editor decorations so layout never becomes editable document content.
Define font substitution and missing-glyph behavior that matches export.

Current product evidence includes a responsive Page Setup task pane with keyboard-operated Page, Columns and Sections, and Header and Footer tabs. The default view contains only paper and margin controls; page-chrome editors mount on demand so compact and desktop workflows do not begin with one mixed, unbounded settings stack. Header and footer formatting actions are divided into balanced text-formatting and alignment/insertion rows instead of leaving orphaned controls on an accidental wrap line; a deterministic phone workflow now covers all three tabs, a live column update, modal isolation, and invoker focus restoration. Paragraph-spacing and paragraph-pagination popovers now expand to a viewport-safe 320 px surface on phones. Their numeric fields, steppers, checkboxes, and reset actions provide 44 px touch targets while preserving direct document commits and exact trigger-focus restoration. A deterministic phone workflow proves both semantic changes and captures accessibility, console, and page-error evidence.

The Writer Insert ribbon now follows the Traditional Office Pages, Table, Illustrations, Links, Header and Footer, and Text sequence, including page-number visibility with the other page-chrome commands. Page Layout exposes direct normal, narrow, moderate, wide, orientation, paper-size, and one-to-three-column presets. Custom margins and advanced columns open the matching controlled Page Setup tab. A deterministic desktop workflow proves live landscape and two-column rendering, advanced-tab routing, Escape close, accessibility output, and empty browser diagnostics.

References, Review, and View now follow the Office-oriented information sequence without advertising an unimplemented table-of-contents command. Review adds direct previous/next and accept/reject commands backed by live revision ranges; resolving a change selects the next available revision and collapses to a safe caret when none remain. View orders document modes before display controls and replaces arbitrary presets with 100%, One Page, and Page Width. The fit commands use live page and viewport measurements, while contextual Picture, Table, and Header and Footer tabs are explicitly distinguished. A deterministic desktop workflow records two changes, navigates and resolves them, exercises both fit modes, and saves accessibility plus empty console and page-error evidence.

Writer's status bar now exposes its word count as a real command instead of a passive label. Clicking it or pressing the Traditional Office Ctrl+Shift+G shortcut opens live page, word, character-with-and-without-spaces, and paragraph statistics, then restores the invoking status control or document caret. The labelled view and zoom toolbar supports arrow-key traversal. At compact Web widths, status items are removed by priority while page position and zoom remain available; a deterministic desktop-to-phone workflow captures both states with accessibility and browser-diagnostic evidence.

Deterministic text collection now follows CSS font weight matching while retaining exact family and normal/italic style boundaries, keeping intermediate and synthesized bold weights on the WASM layout path when a compatible registered face exists. Editing, read-only preview, and PDF composition now share the same base typography and structural content styles. Header and footer content occupies the physical page margins without shifting body flow, while empty headers remain absent and PDF output does not synthesize a filename header. Compact previews keep the same physical page geometry and use bounded scrolling instead of changing margins and text flow to fit the viewport.

Editing and read-only preview now retain one canonical TipTap surface and the same Worker/WASM pagination result, so switching mode preserves shaped runs, automatic page breaks, table fragments, and the computed page count. Page chrome is treated as an overlay inside the physical margins rather than an additional body-height deduction. Browser PDF export finds this mounted surface by stable artifact ID, clones it without editing state, and crops physical pages from bounded batches. The three browser rendering paths therefore share one page-layout result; Latin/Latin-1 vector text clears under measured runs and paints Helvetica at the same geometry for search/copy, with a title/lang/ heading-outline accessibility bootstrap. Full PDF/UA structure trees and CJK/custom fonts remain separate fidelity work.

A deterministic Traditional Office Writer layout gate now covers the first declared native page-parity slice. The fixture uses an A4 page, installed Arial runs, explicit automatic paragraph spacing, a fixed centered table, direct fills and borders, and physical cell margins. Traditional Office exports the reference PDF through its desktop automation API; the browser captures both page surfaces at 794 by 1123 CSS pixels. The comparison requires one physical page, matching title/body/table landmarks within one pixel, no more than a 2% thresholded pixel difference, and a mean absolute channel error no greater than 1.0. The current measured result is a one-pixel maximum landmark delta, a 1.4612% thresholded difference, and 0.7308 mean absolute error. Original OOXML line multiples remain the DOCX round-trip authority instead of being replaced by the browser-only Traditional Office metric.

Four focused matrices now extend that gate beyond Arial and table geometry. The common-font matrix contains 30 rows across Arial, Times New Roman, Calibri, Segoe UI, and Microsoft YaHei at two sizes and two automatic spacing multiples. The CJK matrix contains 36 Latin and Chinese rows across Microsoft YaHei, SimSun, SimHei, FangSong, KaiTi, and DengXian. The explicit document-grid matrix contains 18 rows across three fonts and two sizes. Browser layout uses the measured Traditional Office per-font advance without changing the source OOXML spacing multiple. DOCX import and export also retain each section's docGrid type and line pitch and each run's snapToGrid override. The deterministic browser suite requires one page, exact semantic metric markers, and empty console and page-error diagnostics; the Traditional Office comparison rejects a text-band top drift above three pixels or a consecutive-band advance drift above four pixels. The current maximum top/advance deltas are 3/1 pixels for common fonts, 2/2 pixels for CJK fonts, and 1/1 pixels for the document grid.

The fourth matrix adds 30 Latin, CJK, Arabic, Hebrew, and mixed-formatting rows at two sizes. DOCX import now chooses the Word ascii, hAnsi, eastAsia, or cs font slot from the run text and honors bCs, iCs, szCs, cs, rtl, and rFonts hints before calculating the Traditional Office line-height factor. The same fixture proves paragraph RTL direction, complex-script emphasis, mixed-run bold and italic formatting, one-page pagination, and empty browser diagnostics. Its real Traditional Office 12.1 reference has 30 matching text bands with a three-pixel maximum top delta and a three-pixel maximum consecutive-band advance delta.

Exit evidence:

Deterministic page goldens cover Latin, CJK, Arabic, Hebrew, lists, sections, headers, footers, and mixed formatting.
Typing and selection do not create main-thread tasks above the documented budget on long-document fixtures.
Pagination does not create extra undo entries or move a stable selection.

3. Styles, Lists, and Tables

Make named styles, direct formatting, numbering, restart/continue behavior, nested lists, and theme values round-trip together.
Complete table insertion, selection, row/column/cell operations, merged cells, repeating headers, nested tables, row splitting, borders, shading, alignment, and sizing.
Ensure contextual commands operate on typed selections, including multi-cell and keyboard selection.

Current implementation evidence includes the responsive paragraph-style gallery and a typed list slice with disc/circle/square bullets, five common ordered formats, restart/continue/start commands, keyboard-operated galleries, single-transaction undo behavior, and DOCX round trips for the declared list styles. Writer now has one command catalog for stable Office-oriented tab and group placement plus shortcut metadata. Its displayed Traditional Office font-size, alignment, line-spacing, heading, spelling, field-refresh, comment, and track-changes shortcuts execute inside the document while host text inputs and modal surfaces retain their native keyboard behavior. Traditional Office copy-format and paste-format shortcuts share a permission-free local formatting clipboard with the one-shot format painter; applying it keeps links and review marks intact and commits direct character and paragraph formatting in one transaction. Writer's native All caps and Small caps effects now share one mutually exclusive typed state across the ribbon, standard shortcuts, Format Painter, formatting revisions, page chrome, Undo, and exact w:caps / w:smallCaps DOCX reopen. The source text remains semantic; paragraphs containing a case-shaping effect use browser-authoritative line measurement because transformed glyphs cannot yet be mapped safely onto the layout kernel's source UTF-16 offsets. Writer native fonts now retain independent ascii, hAnsi, eastAsia, and cs slots with exact direct and theme identities plus a separate resolved browser family. Mixed-script runs become bounded TextStyle spans, and the shared Cmd/Ctrl+D dialog exposes independent Latin, East Asian, and complex-text mixed states, Follow style, a segmented preview, and one-step Undo with every other advanced character property. Body and page chrome, notes, Format Painter, formatting revisions, strict/transitional import, diagnostics, exact export, and reopen share the same typed model. A real DOCX cycle proves paragraph- and character-style inheritance, theme resolution, independent slot editing, native w:rFonts output, and reopen; a local-only A3S Test gate covers the keyboard workflow, semantic controls, preview, focus restoration, and Undo. Writer Office 2010 OpenType typography now shares one closed semantic model between ordinary text and structured equations. The advanced Font dialog authors all 16 ligature combinations, number form and spacing, stylistic sets 1-20, and contextual alternates with independent mixed states, Follow style, partial per-run patches, and one-step Undo. Body and page-chrome stories, notes, comments, Format Painter, formatting revisions and rejection, exact w14 namespace export, reopen, diagnostics, and browser-authoritative shaping measurement are permanent local gates. Writer character spacing now uses one signed w:spacing value from -31,680 to 31,680 twips, including explicit zero. Cmd/Ctrl+D and the Home or page-chrome ribbon open one accessible advanced font dialog with mixed-selection safety, exact selection restoration, live preview, validation, and one-step Undo. Format Painter, formatting revisions, body/header/footer import, export, and reopen retain the native value. CSS remains a paint projection while the same advance adjustment stays eligible for Worker/WASM layout. Writer horizontal character scale now uses one native w:w integer from 1% through 600%. Missing values inherit, explicit 100% remains a direct reset, and an empty element resolves to the native 100% default. The shared advanced font dialog tracks scale, spacing, and position independently and commits any combination through one transaction and one Undo record. Body and page chrome, Format Painter, formatting revisions, strict/transitional DOCX import, export, and reopen retain the exact value. CSS projects font-stretch; non-default scale stays on browser-authoritative measurement until the Worker/WASM protocol can carry exact per-run horizontal scaling. No dedicated shortcut is invented. Writer pair kerning now retains one native w:kern threshold from 0 through 3,277 half-points. Explicit zero applies to every font size, positive values activate at effective w:sz >= w:kern, missing values inherit, and complete absence stays disabled. The shared advanced font dialog keeps kerning mixed state independent from scale, spacing, and position, supports direct clearing, and commits the combined draft through one transaction and one Undo record. Every editable Word story, inherited styles, Format Painter, formatting revisions, strict/transitional import, export, and reopen retain the value. CSS, preview/PDF, and Worker/WASM layout share the same effective state; malformed or namespace-spoofed properties fail closed. No shortcut is invented. Writer East Asian emphasis now retains one closed native w:em state for none, dot, comma, circle, and underDot. Missing direct formatting inherits, while explicit none suppresses inherited emphasis without being conflated with Follow style. The shared advanced font dialog tracks emphasis independently from scale, spacing, kerning, and position and commits every touched property through one transaction and one Undo record. Every editable Word story, inherited styles, Format Painter, formatting revisions, strict/transitional DOCX import, export, and reopen retain the typed value. Canonical CSS projects the visible marks; those paragraphs use browser-authoritative line measurement for their out-of-line glyph extents, while a computed explicit none remains eligible for Worker/WASM layout. Malformed or namespace-spoofed properties fail closed. No shortcut is invented. Writer hidden text now retains inherited, native hidden, and explicit visible reset states through one w:vanish model. The shared advanced font dialog keeps mixed state independent, Cmd/Ctrl+Shift+H uses the standard scoped toggle, and one action remains one Undo record. Body and page chrome, notes, Format Painter, formatting revisions, strict/transitional style inheritance, exact export, and reopen retain the value without replacing an existing character style. Hidden text is suppressed by default, in preview, and in PDF; the View ribbon reveals it only while editing with a dotted underline. Malformed or namespace-spoofed values fail closed, unchanged comment XML stays source-preserved, and affected paragraphs use browser-authoritative line measurement. Writer native outline, shadow, emboss, and imprint now retain four independent nullable states through exact w:outline, w:shadow, w:emboss, and w:imprint properties. Missing values inherit and explicit false values remain direct resets. Outline plus shadow is valid; emboss and imprint stay mutually exclusive with every other enabled effect. The shared advanced font dialog keeps each mixed state independent, atomically clears conflicts, and commits one Undo record. Every editable Word story, document defaults, inherited styles, Format Painter, formatting revisions, strict/transitional import, diagnostics, exact export, and reopen share the typed model. Bounded CSS and PDF projections remain paint-only, so eligible paragraphs stay on Worker/WASM layout. Focused Rstest, desktop/compact Playwright, and local-only A3S Test 1.0.0 coverage exercise the public Playground template without adding A3S Test to GitHub Actions or Pages. Writer character borders now retain one exact native w:bdr value across all 25 visible line styles plus nil and none, direct or theme colors with tint/shade, 2–96 eighth-point widths, 0–31 point spacing, and explicit shadow and frame flags. The Home Font group exposes a direct toggle, while the shared advanced font dialog keeps mixed selections safe and distinguishes Follow style, explicit no-border, and a complete editable border. Line style, color, width, spacing, shadow, and frame commit with every other touched character property through one transaction and one Undo record; Format Painter uses the same mark and no non-standard shortcut is claimed. Document defaults, styles, every editable Word story, formatting revisions, strict/transitional import, diagnostics, exact export, and reopen share the typed model. Visible borders use browser-authoritative line measurement because CSS border and padding change inline geometry; explicit resets remain eligible for Worker/WASM, and browser/PDF line styles stay bounded visual approximations. Focused Rstest, desktop/compact Playwright, and the local-only pinned A3S Test 1.0.0 gate cover the public 字符边框 Playground template, single-step Undo, accessibility, and empty browser diagnostics without adding A3S Test to Actions or Pages. Writer character shading now retains one exact native w:shd value for every schema pattern, direct or automatic foreground/background colors, independent theme channels with tint/shade, and explicit nil. Document defaults, paragraph and character styles, conditional table styles, every editable Word story, formatting revisions, strict/transitional import, diagnostics, exact export, and reopen share the closed model. The advanced font dialog keeps mixed selections untouched and distinguishes Follow style, explicit no-shading, and editable pattern/color states; Format Painter and one-step Undo use the same TextStyle attribute. Native w:highlight remains independent and takes paint precedence without clobbering shading. CSS pattern projection changes no inline geometry, so eligible content remains on Worker/WASM layout. Focused Rstest and the public 字符底纹 Playground template cover the semantic authoring and round-trip path; browser ACL coverage remains local-only and is never added to Actions or Pages. Writer proofing languages now retain independent native w:lang Latin, East Asian, and bidi slots plus explicit w:noProof true or false state. Document defaults, inherited styles, every editable Word story, formatting revisions, strict/transitional import, diagnostics, exact export, and reopen share the closed model. Review and page-chrome editing use one accessible mixed-safe dialog with bounded BCP 47 input, per-slot Follow style, exact focus restoration, one transaction, and one Undo record. Canonical DOM language and proofing attributes remain separate from the browser-wide spellcheck switch; validated effective language tags also reach Worker/WASM RustyBuzz shaping. Focused Rstest, desktop/compact Playwright, and the local-only A3S Test gate cover the public 校对语言 Playground template without adding A3S Test to Actions or Pages. Bundled dictionaries, grammar, and translation remain a host/provider boundary. Writer Table of Contents now uses one selectable, non-editable typed block with semantic heading/native outline levels 1–9, hyperlinks, page-number visibility and alignment, dot/dash/underline/no leaders, stable heading targets, and at most 512 cached entries. Insert, selected-block customization, and explicit all-TOC refresh each create one transaction and one Undo record. The shared outline collector is the only heading source and the live pagination field resolver is the only page-number source. Included items without paragraph identities receive them inside the same insert/update transaction. Native DOCX export, import, and a second export retain a real w:sdt/TOC field, cached entries, heading bookmarks, and exact leader semantics. Common lossless switches reopen as editable state; custom style mappings, partial page ranges, malformed ranges, and unsupported separators are diagnosed instead of approximated. Focused Rstest, responsive UI coverage, the public 可更新目录 Playground template, and a local-only A3S Test gate cover discoverability, editing, refresh, focus recovery, Undo, accessibility, and empty browser diagnostics without adding A3S Test to Actions or Pages. Writer native indexes now use stable selectable documentIndexEntry atoms and one selectable generated documentIndex block. Primary and secondary terms, cross-references, bold/italic page intent, 1–4 columns, indented/run-in layout, alignment, and four leader modes stay typed. The shared pagination field resolver is the only page source; normalized duplicate terms on the same page merge without discarding marker identities. Each mark/edit, block insert/customize, and all-index refresh is one transaction and one Undo record. At most 2,048 markers contribute to at most 512 cached rows, with explicit truncation beyond either bound. Native DOCX export, import, reopen, and second export retain w:fldSimple XE fields, a real w:sdt/INDEX field, cached Index1/Index2 rows, cross-references, page emphasis, columns, and leaders. Only the lossless common switch subset becomes editable; range markers, custom types, locale controls, malformed structures, and unknown switches remain diagnosed. Focused Rstest, responsive UI coverage, the public 原生索引 Playground template, and a local-only A3S Test gate cover discovery, marking, refresh, focus recovery, Undo, native reopen, accessibility, console, and page errors without adding A3S Test to Actions or Pages. Writer document compare/combine now forms one completed bounded vertical slice. Review can import DOCX, HTML, or TXT against the current controlled baseline, deterministically align same-layout paragraphs and headings, and generate reviewable insertion, deletion, character-formatting, paragraph-formatting, and bounded same-section text-move revisions in one transaction and one Undo record. A move is admitted only for a unique lexical range with matching marks and safely carried separators inside one simple paragraph or heading, or across aligned simple text blocks in the same section; duplicate, mark-mismatched, rich, section-boundary, table, and over-limit candidates remain ordinary revisions or diagnostics. Combine admits a reviewed copy only when rejecting all of its revisions exactly reconstructs the current baseline. The public 文档比较 Playground template, bilingual references, focused Rstest, responsive Playwright, native w:ins/w:del/w:rPrChange/w:pPrChange reopen coverage, and local-only A3S Test gate cover the shipped path. Exact text-only whole-paragraph insertions and deletions now also round-trip through matching native w:pPr/w:rPr paragraph-mark records and retain one atomic block decision. Isolated paragraph-break merge/split revisions, mixed-content marks, changed complex structures, cross-section/range move generation, and multi-copy structural conflict resolution remain explicit fail-closed follow-up work. Existing strict or transitional text-only w:moveFrom/w:moveTo pairs still import as one atomic review item and round-trip natively; rich, range-marker, relationship-bound, or unpaired moves remain diagnosed instead of being flattened. Writer character baseline position now uses one signed w:position value from -3,168 to 3,168 half-points, including explicit zero. The same advanced font dialog exposes Normal, Raised, and Lowered modes while tracking mixed scale, spacing, and position independently; changing all three still produces one transaction and one Undo record. Body and page chrome, Format Painter, formatting revisions, strict/transitional DOCX import, export, and reopen retain the exact value. CSS projects the offset with numeric vertical-align, gives native subscript or superscript precedence when both properties coexist, and deliberately keeps positioned paragraphs on browser-authoritative measurement until the text layout protocol carries per-run baseline offsets. Writer underline formatting now uses one typed mark for all 18 native w:u values, direct RGB or theme/tint/shade color identity, and explicit none. The Home ribbon, selection toolbar, page chrome, Format Painter, formatting revisions, Undo, export, and reopen retain that state. CSS renders bounded browser projections without changing Worker/WASM layout eligibility, and the standard single, double, and words-only shortcuts share the same commands. Writer strikethrough now uses one typed none | single | double mark instead of flattening native state to a boolean. Independent w:strike and w:dstrike inheritance, explicit resets, body and page-chrome editing, Format Painter, formatting revisions, Undo, export, and reopen all retain the exact state. Accessible split controls expose the complete family without inventing a shortcut; TipTap's unrelated Mod+Shift+S binding is disabled. CSS projection remains paint-only and does not change Worker/WASM layout eligibility. Header and footer surfaces use the same Traditional Office alignment and format-copy commands, falling back to their compatible paragraph schema when body heading formats are pasted. Undo and redo use the quick-access row, while double-clicking the active tab persistently collapses the ribbon; tab activation temporarily overlays commands and outside pointer input closes that overlay without moving document layout. The toolbar's measured width compacts low-priority groups first, normal-priority groups second, and retains high-priority groups before horizontal paging. A deterministic desktop workflow checks comfortable, adaptive, collapsed, and temporary states, accessibility output, and empty console and page-error diagnostics. Compact ribbon overflow now reserves both navigation edges so tool width does not change after paging. Phone list galleries stay within the viewport and provide 44 px clear, restart, start-value, stepper, and commit controls. Closing a list command restores the TipTap selection as well as DOM focus, so reopening the numbering gallery retains its active style and start settings. A deterministic phone workflow covers two ribbon advances, square bullets, upper-Roman numbering, a custom start value, editor-focus recovery, and Escape-to-invoker restoration. Tables now expose separate Design and Layout contextual tabs, five keyboard-operated style presets, multi-cell fill, and a reusable border pen with all, outside, inside, side, inside-horizontal, and inside-vertical targets. Horizontal and vertical alignment, exact column- width and row-height fields, equal row/column distribution, content/window autofit, row/column operations, merge/split, repeat-header, and non-splitting row controls are also available. Common cell shading, vertical alignment, explicit per-edge borders, fixed grid widths, layout mode, and explicit row heights round-trip through editable HTML and DOCX. Table geometry now models the layout algorithm, auto/percentage/pixel preferred width, alignment, indent, table-level cell margins, and cell-level margin overrides independently. tblLayout, tblW, jc, tblInd, tblCellMar, tcMar, tblGrid, and tcW round-trip without treating grid data as the preferred table width. A real fixture proves that a centered 62.5% table with a first-cell margin override keeps matching edit and preview geometry. Table insertion or removal does not reinterpret an imported autofit table as fixed merely because it has grid widths. Percentage column preferences round-trip as tcW while stable pixel tblGrid widths remain browser-layout fallbacks, including across merged cells. The Layout ribbon reports the rendered column width for autofit tables and labels noncanonical preferred widths as Current width instead of misreporting them as fixed. The Table Properties dialog now owns four coherent tabs: Table, Row, Column, and Cell. It combines auto, percentage, or centimeter preferred table width, left/center/right placement, and left indent with selected-row height and rule, page splitting, repeated headings, percentage or centimeter current-column width, selected-cell vertical alignment, and four-edge margins. The complete validated draft commits in one TipTap transaction and one undo record; Cancel and Escape preserve the last committed state and restore the exact ribbon invoker. Values the user did not edit retain their exact imported pixels and partial inheritance instead of round-tripping through the two-decimal centimeter display. The deterministic styled-table workflow checks truthful 62.5% centered import values, all four tabs and touch-sized controls at 390 px, an atomic change to 72% left placement with a 0.5 cm indent, a 1.2 cm exact row, disabled page splitting and repeated headings, a 4 cm column, centered cell content, a 0.4 cm left cell margin, cancellation safety, exact untouched 8 px and 16 px margin edges, and matching preview geometry with clean browser diagnostics. Table-level outer and inside DOCX borders resolve to cell edges on import without flattening mixed styles. Direct table and cell theme colors now resolve through the package theme, including themeTint, themeShade, themeFillTint, and themeFillShade. The resolved colors remain identical in edit and preview. Untouched run text, run shading, cell fills, and independent cell borders retain their semantic theme references, tint, and shade on export with the resolved RGB as a valid fallback; an explicit color edit exports direct RGB and clears stale semantics. DOCX table styles now resolve the default or referenced table style through a bounded, cycle-safe basedOn chain. tblLook flags or bitmasks, row and column band sizes, grid spans, and row grid offsets select whole-table, banded row or column, first/last row or column, and corner-cell conditions in Word precedence order. Conditional fills, per-edge borders, fonts, colors, bold, italic, underline, and strikethrough enter the same edit and preview model before direct table, cell, paragraph, and run formatting. Conditional paragraph alignment, direction, indents, spacing and line rules, pagination rules, and tab stops follow that same precedence. Theme-derived style colors are materialized as stable RGB on export. A real conditional-style DOCX fixture is covered by deterministic A3S Test evidence for header, body-band, last-row, and paragraph-layout presentation with a clean browser diagnostic run. Splittable rows taller than a complete continuation-page body now fragment at measured paragraph boundaries instead of overflowing as one atomic row. The same layout path repeats leading heading rows on each continuation page. A real DOCX fixture with one 120-paragraph body row deterministically produces three physical pages; A3S Test verifies the page-two and page-three cell breaks and repeated headings, keyboard access to the final marker and following paragraph, and an error-free browser run. Desktop insertion keeps an 8 × 10 keyboard matrix without duplicate cell semantics, while phone insertion uses focused row and column controls with 44 px touch targets. A deterministic phone workflow now proves 3 × 3 insertion, row extension, compact-ribbon deletion, and editor-focus recovery. Percentage-width column authoring now retains pixel grid fallbacks, and nested tables remain editable through targeted inner-table commands and DOCX round-trips. Outer rows paginate at nested-row boundaries instead of treating a tall inner table as one atomic block. Row-spanning cells participate in every covered physical row with contiguous content ranges and in-cell page-break widgets; combined row and column spans retain vMerge and gridSpan through DOCX round-trips.

Imported Word list identities now survive the DOCX-to-controlled-HTML boundary as explicit numbering, abstract-numbering, and level metadata. Export reuses a single generated DOCX numbering instance across separated runs with the same native identity, retaining continuation semantics instead of assigning each run an unrelated list. This establishes the identity boundary required by the remaining multilevel fidelity work.

Native numFmt values supported by the OOXML writer and compound lvlText patterns now survive that same boundary, including non-Latin numbering families and references to parent levels. Continue Numbering adopts the preceding native identity and definition; an explicit gallery style change clears stale imported format and text metadata before export. Native suffix, level alignment, physical or logical indentation, hanging or first-line offsets, and lvlRestart rules now follow the same round-trip path. Logical start and end indentation remain distinct for RTL numbering instead of being flattened to physical left and right values.

Conditional table-style paragraph properties now retain contextual spacing and outline levels through the same default-style, paragraph-style, inherited table style, conditional region, and direct-format precedence chain. Both properties enter the controlled editor model, participate in format copy and explicit format clearing, and return to DOCX paragraph properties. Focused package and round-trip evidence covers direct overrides against wholeTable and firstRow conditions.

Exit evidence:

Formatting and table operations have command, interaction, undo, DOCX, and visual tests.
Large tables paginate without duplicate content, selection loss, or quadratic reflow.

4. Media, Fields, and Page Objects

Complete inline and floating images, wrapping, anchors, captions, links, bookmarks, cross-references, page numbers, dates, fields, footnotes, and endnotes.
Keep object identity stable across move, copy, delete, undo, and DOCX relationship updates.
Make image and object dialogs validate size, placement, alternative text, and destructive replacement before commit.

Current implementation evidence includes one project-owned file materialization boundary shared by Word body images, header/footer images, Presentation images, and imported Office/PDF files. File inputs can reset immediately for same-file reselection without invalidating an in-flight read. Unit coverage verifies single-read ownership and the A3S Test picture fixture verifies that a relative-path PNG reaches the Word canvas and opens its contextual picture toolbar without a false read error. The phone picture workflow now exercises one Picture Properties dialog for centimeter width and height, per-image aspect-ratio locking, square, tight, through, top-and-bottom, and no-wrap free-floating placement, wrap-side selection, alignment, text distance where applicable, signed horizontal and vertical anchor offsets with column, paragraph, margin, or page reference frames, four-edge percentage cropping, quarter-turn rotation, horizontal/vertical reflection, and alternative text. No-wrap images use a one-pixel pagination anchor instead of reserving their rendered height, remain absolutely positioned in edit, preview, and print surfaces, and use the existing behind-text drawing-layer option to select whether text paints above or below the image. The complete draft commits as one undo entry, untouched imported dimensions keep their exact source values, the selected image remains active, and apply, cancel, and Escape restore the exact Picture Properties command so the next keyboard action cannot mutate document content. The ribbon and dialog expose the same bounded 90-degree rotation and reflection model; DOCX export/reopen verifies a:xfrm rot, flipH, and flipV, while arbitrary-angle or malformed values receive a visible compatibility diagnostic and normalize safely. Image nodes now carry a stable object identity together with their native DOCX drawing-property, floating-anchor, and edit identifiers. Transaction mapping keeps the pre-existing object stable when a copy is inserted on either side, creates a complete independent identity for the copy, and retains identity through move, cut-and-paste, delete, undo, and redo. DOCX regeneration assigns unique wp:docPr identifiers, preserves wp14:anchorId plus untouched wp14:editId values for inline and supported floating drawings, advances the edit identifier when the image is changed or moved, and validates every emitted image relationship without using the relationship ID as object identity. Word body bookmarks now use paired inline boundaries rather than a flattened single marker, so a target can span paragraphs while remaining one atomic editable range. New names follow Word's 40-character letter-first convention; imported hidden names remain valid, malformed or duplicate identities are normalized deterministically, and copying a complete range assigns a new name, internal identity, and native numeric identifier while preserving the original. Internal links export through w:anchor without an external relationship, supported web and email destinations retain hyperlink relationships, and deleting a bookmark gives every dangling internal link an explicit state that undo repairs. DOCX inspection reports ambiguous boundary pairs, normalized names, column-scoped bookmarks, missing targets, unsupported destinations, and advanced hyperlink metadata separately. Body bookmarks are also available in the cross-reference picker: their live display follows target edits, deletion produces an explicit missing-reference state, undo repairs it, and copy normalization retargets self-references to the copied identity. Native DOCX import/export preserves ordinary bookmark REF fields with the supported hyperlink switch and diagnoses advanced switches separately. Unit round trips cover cross-paragraph native ranges, internal-versus-external relationships, and bookmark fields; a deterministic phone workflow covers dialog focus, reference insertion, deletion, the missing-reference transition, and exact editor-focus recovery. Footnote and endnote references now share one live identity graph with their editable definitions. Each kind renumbers independently from reference order; copy creates a new identity with cloned note content, deleting either complete side removes its pair, and undo or redo restores the graph atomically. New footnotes stay with their reference section while new endnotes use the final section. Controlled HTML normalization and DOCX inspection detect repeated, missing, unreferenced, or nested identities, and the high-priority note parser preserves native references through export, import, and a second export. Unit coverage exercises reverse insertion, copy, deletion from either side, undo/redo, final-section endnotes, malformed controlled HTML, diagnostics, and native footnote/endnote round trips; a deterministic phone workflow covers live renumbering, paired deletion, restoration, accessibility, and browser diagnostics. Body PAGE, NUMPAGES, SECTION, SECTIONPAGES, DATE, TIME, NUMWORDS, and NUMCHARS fields now resolve from the measured Worker/WASM page containing each atom, including physical-page membership for continuous sections. Numeric statistics exclude generated field results, preserve word boundaries around inline atoms, and count spaces separately from line-break separators. Pagination refreshes numeric results without adding history or advancing clock fields; scoped F9 refreshes all field kinds as one undoable action. The cross-reference picker can create a bookmark-backed PAGEREF that stores stable target identity, follows bookmark normalization, and reports a missing target instead of serving stale semantics. Transaction mapping preserves moved field identities, gives copied atoms fresh redo-stable identities, and keeps insertion plus its initial refresh in one history step. Native DOCX simple and complete inline complex fields round-trip twice; only the bounded common switch grammar is atomized, while unsupported, nested, cross-paragraph, deleted, or instructionless structures remain cached text with explicit compatibility diagnostics. Unit coverage exercises live page contexts, statistics, bookmark retargeting, copy and undo/redo identity, clock-safe automatic refresh, structural diagnostics, and native DOCX output; a deterministic phone workflow covers common fields, bookmark page references, physical PAGE and NUMPAGES results, F9, atomic undo/redo, accessibility, and browser diagnostics. Caption order and cross-reference validity now share one live transaction graph: deleting or reordering a caption renumbers surviving targets, updates every linked field, and renders dangling references as an explicit missing state. Caption numbers are included in the accessible caption name, and a deterministic phone workflow proves dialog focus, insertion, deletion, and the missing-reference transition.

Exit evidence:

Relationship-bearing objects reopen with working targets in Word and Traditional Office.
Object layout has deterministic fixtures at page and section boundaries.

5. Review and Long-Document Quality

Finish anchored comments, replies, resolve/reopen, tracked insert/delete, accept/reject, citations, navigation, find/replace, outline, and references.
Define conflict behavior when a controlled host update changes a reviewed range.
Keep outlines, search results, revision review, and comment review on bounded windows, and incrementally derive page chrome for large files.

Current implementation evidence includes a persistent Word-style navigation pane with a typed heading hierarchy, active-heading tracking, collapsible branches, keyboard traversal, and responsive left-side placement. Its search returns full-text results with section context, bounded excerpts, match highlights, and safe selection-based jumps that do not create history entries. Compact result selection closes the modal pane before restoring the exact body selection and focus. The same pane now offers a page view with real rasters cropped from the live paginated surface, physical-page and restarted-page-number labels, active-page tracking, arrow/Home/End keyboard traversal, and selection-safe jumps to each page. The current and adjacent pages enter a serialized capture queue first; the rest use bounded viewport admission, debounced source-mutation refresh, and off-screen image release. Measured text is retained only as a loading or failure fallback. Capture readiness does not depend on unrelated document fonts or animation frames that background agent tabs can suspend. The dedicated Find/Replace task pane now has deterministic phone-width coverage for query entry, match navigation, single replacement, disabled-action focus recovery, content synchronization, and modal close-to-invoker focus restoration. The compact revision pane now exposes recording controls inside its modal boundary, reports whether new changes are actually being recorded, retains focus when that state changes, and keeps the truthful active state after the last pending revision is resolved. A deterministic phone workflow covers enabling tracking, creating and accepting an insertion, empty-state recovery, and exact invoker restoration. Revision collections above 48 items now reuse the same bounded window as document navigation, mounting at most 32 contiguous rows while physical spacers preserve the complete scroll range. Arrow, PageUp/PageDown, Home, and End keep the whole review queue keyboard reachable; individual accept/reject decisions retain the same action focus on the next revision. A real DOCX fixture with 120 native OOXML insertions proves bounded mounting, first/last access, the 120-to-119 decision transition, focus continuity, spacer geometry, and an error-free browser run. Character- and paragraph-formatting revisions now form separate review kinds. Paragraph tracking captures one canonical full-property baseline across a multi-paragraph command, preserves it through later pending edits, and resolves the group atomically. Accept, reject, and the source formatting command have independent undo boundaries. Strict and transitional w:pPrChange import and export preserve the supported old paragraph properties, while malformed or unsupported records stay structural diagnostics. Browser/Yrs collaboration converges the distinct immutable decision kind and prevents suggest peers from changing paragraph-revision metadata. Focused A3S Test suites prove both rejection paths against the public Playground with screenshots, accessibility, and empty console/page-error evidence. Text-only move revisions now form one paired review kind with explicit source and destination roles. Accept/reject resolves both sides atomically, navigation targets only the destination, browser/Yrs records one immutable changeKind: "move" decision, and strict/transitional DOCX export/reopen retains native w:moveFrom/w:moveTo wrappers without private marker leakage. Focused model, collaboration, diagnostics, panel, and DOCX tests cover the bounded subset. Comment collections above 48 items now mount at most 32 contiguous cards while the active comment and comments with unsent replies remain pinned. Anchor geometry is collected in one linear pass, connector rendering is limited to mounted cards, and measured card heights are reused when a card leaves the window. Arrow, PageUp/PageDown, Home, and End traverse the complete collection; keyboard navigation keeps the document selection, physical page, review window, and focus synchronized. Deleting a comment moves focus and selection to its adjacent surviving comment. A real DOCX fixture with 120 native OOXML comments proves anchor import, bounded mounting, first/last access, the 120-to-119 deletion transition, page synchronization, and an error-free browser run. New comment drafts stay inside the visible review rail even for document-wide selections, and discard confirmation is limited to drafts or replies that contain written content. Cancelling a task-pane switch now returns keyboard focus to the exact unfinished comment, reply, or citation field on desktop and compact layouts, so protected content can be edited immediately. The same editing context is retained when users cancel comment deletion, citation deletion, or an internal citation switch. Citation source validation is now attached to the exact invalid tag or title field, moves keyboard focus to that field, and clears only when its value changes. A deterministic phone workflow covers validation, source persistence, citation insertion, and exact close-to-invoker focus restoration. Raster-quality page thumbnails and bounded raster admission are implemented. Page buttons now use a bounded window with physical scroll spacers and sparse current/focus pins. A deterministic 120-page DOCX workflow proves Home/End navigation, selection, focus retention, and bounded mounting. The same window model now bounds heading and search-result rows above 48 items to at most 32 contiguous rows plus sparse active, selected, and keyboard-roving pins. The real 120-page fixture contributes 120 headings and 120 matches; deterministic browser evidence proves first/last keyboard access, exact final-result selection, physical spacer geometry, and zero console or page errors. Comments now have the same bounded long-review evidence. Page-chrome descriptor derivation is incremental as well: a tail edit reuses the stable physical-page prefix, including resolved first/default/even headers, footers, page numbers, preview text, and jump targets. The deterministic 120-page DOCX workflow proves that a final-page edit reuses 118 descriptors and derives only the two-page boundary suffix while page navigation, focus, console, and page errors remain stable. Controlled host replacements now have an explicit review-conflict contract. The host value remains authoritative and does not enter local undo history, while stable IDs and reviewed text distinguish harmless range movement from comment text changes, removed anchors, removed revisions, and revision-kind reuse. Intentional comment deletion removes both the thread and anchor without warning; document switches are isolated by artifactId. React, Vue, and Web Component hosts receive the same typed conflict event, an accessible in-editor warning exposes the condition to users, and orphaned comment records survive later local edits until the host removes or restores them. Deterministic unit and adapter regressions cover movement, mutation, removal, persistence, deduplication, restoration, and document switching.

Exit evidence:

Review operations retain authorship, anchors, replies, and state through DOCX round trips within the declared compatibility boundary.
Representative 100-page and review-heavy fixtures meet interaction, memory, reflow, and save budgets.

Priority 2: Markdown

After the Document gates above are stable:

Prove lossless switching between source, split, visual, and preview modes for the supported GFM model.
Complete tables, task lists, links, images, fenced code, escaping, and clipboard behavior.
Publish Markdown Extension parse/serialize requirements and fixtures.
Keep source typing coalesced and visual updates responsive on large files.
Keep source undo/redo independent from browser-native textarea history, restore selections, rebase on host replacements, and avoid duplicate visual history records during synchronization.
Keep the default split view directly resizable without breaking synchronized scrolling; at phone widths, give Source or Preview the complete workspace through one explicit, touch-sized switch.
Keep the preview a calm reading surface with a bounded line length and one visual hierarchy across headings, prose, quotations, code, tables, and task lists.

Exit evidence: canonical Markdown fixtures round-trip without semantic drift, custom structural Extensions have serialization tests, source/visual undo remains one coherent history, and desktop split plus phone full-pane behavior pass visual and deterministic E2E regression.

Priority 3: Spreadsheet

The first Traditional Office-alignment slice now adopts the Writer-proven shared ribbon behavior without importing Writer's document model. Spreadsheet owns one command catalog for stable tab order, labels, locations, and shortcut metadata; Undo and Redo live in quick access; the ribbon compacts by group priority, persists a double-click collapse, and temporarily exposes a selected tab. Conditional Formatting is located under Home and Styles, executable ascending and descending sorts are under Data, and workbook recalculation is available from Formulas and F9. Focused unit and component tests plus desktop and compact Playwright coverage prove the command placement and interaction path. The deterministic A3S Test manifest validates independently and records the same desktop workflow when a browser capability is installed. The second slice adds Paste, Cut, and Copy as the first Home group instead of leaving core clipboard behavior discoverable only through shortcuts and context menus. Buttons and Cmd/Ctrl+V, Cmd/Ctrl+X, and Cmd/Ctrl+C all cross the same typed command port, retain the permission-resilient browser/local clipboard fallback, and restore grid focus after a successful command. Desktop and compact browser regression executes the complete copy-paste-cut path. The third slice adds Format Painter beside the clipboard commands. A single click captures the selected native cell-style pattern for one target, while a double click keeps the session locked across repeated and cross-sheet targets. Single-cell targets expand to the source dimensions and larger selections tile the pattern. Values, formulas, comments, links, and merges stay untouched; another click or Escape cancels the mode. A 50,000-cell source and target guard, duplicate-target suppression, one controlled batch per application, accessible pressed/live state, and copy cursor keep the Web interaction bounded and predictable. Focused model, hook, controller, and component tests plus desktop and compact browser regression cover the complete one-shot and locked paths. The fourth slice adds AutoFilter under Data and Sort and Filter. A single-cell selection expands to the bounded contiguous current region, while an explicit multi-row selection keeps its exact coordinates. Cmd/Ctrl+Shift+L toggles the filter and Alt+ArrowDown opens the selected header menu. Arrow keys, Space, Enter, and Escape operate the value checklist and restore grid focus. The model rejects empty data, merged intersections, and pivot sheets before a controlled mutation, preserves filter-owned row visibility when toggled, and round-trips the active range and hidden rows through XLSX. Focused model, hook, controller, component, import/export, desktop, and compact regression cover the complete enable, apply, disable, and restore path. The fifth slice adds Freeze Panes under View and Window. A current-cell freeze uses the Traditional Office boundary of rows above and columns left, while dedicated top-row and first-column presets cover the two common one-axis workflows. The active menu exposes Unfreeze Panes, disables a no-op boundary, supports Arrow, Home, End, Enter, and Escape, and returns focus to the grid without a delayed focus guard closing a repeated command. A pure workbook model owns the boundary, selection retention, no-op checks, and one controlled update. Focused model, controller, component, focus, XLSX round-trip, desktop, compact, and schema-validated A3S Test coverage prove the complete freeze and unfreeze path. The sixth slice exposes the existing row and column structure commands under Home and Cells through one Office-familiar Rows and Columns menu. Its six actions insert selected rows above or below, insert selected columns to the left or right, or delete selected rows or columns. Availability remains derived from the live workbook selection and protection state; the ribbon does not create a second mutation model. Arrow, Home, End, Enter, and Escape operate the menu, successful commands return focus to the grid, and desktop plus compact Playwright coverage exercises an insert-and-restore workflow. Focused catalog, component, and focus tests plus the schema-validated A3S Test manifest keep the information architecture and command boundary stable. The seventh slice moves cell merging into Home and Alignment as an Office-familiar split control. Its primary action and Ctrl+M execute Merge and Center, while the disclosure menu also offers Merge Cells, Merge Across, Unmerge Cells, and Unmerge and Fill. Availability comes from the current selection and Fortune's native merge ranges. Each intent is translated into one batchCallApis transaction, so alignment, native merge state, and fill propagation share one controlled update. Arrow, Home, End, Enter, and Escape operate the menu; successful actions return focus to the grid and Escape returns to the exact disclosure invoker. Focused model, controller, component, and focus tests plus XLSX round-trip, desktop, compact, and deterministic A3S Test coverage protect the workflow. The eighth slice exposes Clear under Home and Editing with Clear All, Clear Formats, Clear Contents, Clear Comments, and Clear Hyperlinks. Delete and Backspace execute Clear Contents through the same typed command. Content-only clearing retains formats, comments, hyperlinks, and merge geometry; format-only clearing retains values, formulas, comments, hyperlinks, and merge geometry while subtracting the selected range from direct, border, conditional, and alternating formats. Clear All removes cell state but retains merge geometry. Each intent produces one controlled workbook batch, successful ribbon actions restore grid focus, and Arrow, Home, End, Enter, and Escape operate the disclosure menu on desktop and compact Web.

The ninth slice establishes a maximum-dimension sparse Spreadsheet contract. An XLSX worksheet may retain 1,048,576 logical rows and 16,384 logical columns without allocating its empty range. Virtual navigation, search, selection, formula dependency scans, formatting, filtering, statistics, collaboration, and host projection visit only materialized cells. Editing a far blank row creates exactly that row. Import and export retain the logical dimensions plus compact validation, protection, passwordless editable, and conditional-format ranges. Focused unit and round-trip tests and a deterministic A3S Test workflow cover Control+End, read-only far navigation, one-row materialization, persisted editing, accessibility, console output, and page errors.

The tenth slice completes the first missing Traditional Office font-emphasis path. Home and Font now exposes Strikethrough with the Traditional Office Cmd/Ctrl+5 shortcut. The button, shortcut metadata, and editor keymap come from the Spreadsheet command catalog; both entry points use the existing typed setCellFormat command and Fortune's native cl cell style. Successful commands restore grid focus, create one undoable controlled update, remain scoped away from host text inputs and modal surfaces, and continue through Clear Formats and Format Painter without a parallel style model. Focused catalog, controller, component, desktop browser, and schema-validated local A3S Test coverage protect the workflow.

The eleventh slice adds cell borders to Home and Font through an Office-familiar split control. Top, bottom, left, right, no, all, outside, inside, horizontal, vertical, and diagonal targets share ten native line styles and an exact color input. The A3S-owned immutable command normalizes the live range, compacts overlapping native records, preserves malformed vendor state, emits one controlled update, and restores grid focus without calling Fortune's mutable border command. Diagonal formatting is capped at 4,096 cells because the native renderer requires one record per cell. Focused model, controller, component, focus, desktop and compact Canvas rendering, undo, and schema-validated local A3S Test coverage protect the complete workflow. GitHub Actions keeps A3S Test excluded and runs the Playwright rendering contract.

The twelfth slice adds Fill to Home and Editing with Down, Right, Up, and Left commands. The menu uses Arrow, Home, End, Enter, and Escape, while Cmd/Ctrl+D and Cmd/Ctrl+R share the same typed command path and retain grid focus. Each direction copies the appropriate selection edge through Fortune's native relative-formula, number-series, and style semantics in one history record. Preflight rejects multiple selections, merged intersections, pivot sheets, read-only rows or columns, protected cells, inactive sheets, and more than 50,000 target cells. The focused adapter satisfies Fortune's sparse-matrix precondition by creating only missing row arrays inside the selection and restores the exact sparse shape on a native failure. Unit, controller, component, focus, desktop, and compact Playwright regressions cover all four directions, formula and bold-style propagation, one-step Undo and Redo, and Ctrl+R browser-refresh ownership. A schema-validated A3S Test ACL remains a local release gate; GitHub Actions neither installs nor runs A3S Test.

The thirteenth slice completes the common Traditional Office number-format path under Home and Number. General, Number, CNY Currency, Accounting, Percentage, Short Date, Time, Scientific, Fraction, and Text now map to explicit Fortune ct codes and types instead of presenting date, time, currency, scientific, fraction, and text cells as an undifferentiated Custom state. The grouped picker exposes all presets, direct Currency and Percentage buttons advertise their shortcuts, and Cmd/Ctrl+Shift+~, !, $, %, #, @, and ^ share the same typed selection command. Each action preserves values and formulas, produces one native controlled update and one Undo record, and retains its exact format code through XLSX export and reopen. Decimal adjustment skips date, time, fraction, text, and unknown custom codes and no longer edits digits inside locale tags. Focused parser, catalog, controller, component, XLSX, desktop, and compact Playwright coverage protects the complete path. A3S Test remains a local-only release gate and is absent from GitHub Actions.

The fourteenth slice adds an Office-familiar Cell Styles gallery under Home and Styles. It owns 17 built-in choices grouped as Common, Data and Model, and Titles and Totals, renders the native appearance in each preview, and supports Home, End, and two-dimensional arrow navigation across desktop and compact layouts. A single typed selection command applies Fortune's native font, fill, emphasis, and per-cell border properties to at most 10,000 populated or blank cells. It preserves values, formulas, comments, links, merges, alignment, and number formats, publishes one controlled value, and creates one Undo record. Current-state recognition resolves the focused cell's native border records and does not introduce a second style marker. The XLSX path now round-trips direct font family, size, color, emphasis, solid fill, alignment, wrap, rotation, four side and diagonal borders, and the original number-format XF; theme, indexed, automatic, and tint colors resolve to stable RGB. Focused model, controller, component, import/export, desktop, compact, accessibility, blank-cell, and Undo coverage protects the path. The deterministic A3S Test ACL remains a local release gate; GitHub Actions uses the equivalent Playwright regression only.

The fifteenth slice makes Increase Decimal and Decrease Decimal first-class Home and Number commands instead of toolbar-only helpers. The command reads each selected cell's native format independently, so mixed Currency, Accounting, Percentage, Number, and Scientific selections retain their format families. Date, time, fraction, text, and unrecognized custom codes remain unchanged. Equal results compact into rectangular native calls, the complete gesture commits through one batch and one Undo record, and a 10,000-cell guard prevents a blank maximum-size selection from becoming dense. Focused model, catalog, controller, component, and desktop browser coverage protect mixed format semantics and focus restoration.

The sixteenth slice adds the complete Office-style Format Cells workflow to Home and Number and the editor-scoped Cmd/Ctrl+1 shortcut. One modal surface owns Number, Alignment, Font, Border, Fill, and Protection tabs, including custom number codes, wrapping and rotation, mixed font emphasis, per-edge and diagonal borders, no-fill state, and compact locked or hidden ranges. The dialog captures the exact worksheet, range, active cell, and source cells when it opens. A later selection change therefore cannot retarget Apply. Mixed selections retain every untouched field; only explicitly changed fields are unified. Applying all six tabs emits one controlled onChange and creates one Undo record, while Cancel and Escape emit neither. Dense data and sparse celldata worksheets retain their original representation, formatting a blank cell materializes only that cell, and removing an absent property does not materialize it. General formatting is bounded to 10,000 cells and diagonal borders to 4,096 cells. The shortcut remains with host inputs, formula and cell editing, and modal controls. Focused Rstest model, controller, component, history, and focus coverage plus desktop and compact Playwright regression exercise launch, six-tab Apply, reopen, and one-step Undo. A3S Test remains an optional local-only release aid; GitHub Actions and Pages neither install nor run it and use Rstest, Playwright, and Cargo instead.

The seventeenth slice adds the Traditional Office AutoSum split command before Fill under Home and Editing. Sum remains the primary action and owns the editor-scoped Alt+= shortcut; the disclosure menu adds Average, Count, Maximum, and Minimum with Arrow, Home, End, Enter, and Escape behavior. A single blank target infers the nearest contiguous numeric or formula run above before falling back to the left. Explicit totals rows and columns discover numeric/formula axes, preserve labels and text-only axes, and compact consecutive outputs into native ranges. Every function writes native formulas, retains target formatting, updates the formula bar, and commits through one Fortune batch, one controlled onChange, and one Undo record. Preflight rejects occupied eligible targets, multiple selections, inactive or read-only sheets, merged or protected targets, pivot sheets, invalid Excel coordinates, and more than 1,000 formula outputs. Sparse celldata is read through indexed coordinates without a dense projection. Focused planner, command, editor, catalog, ribbon, focus, desktop, and compact Playwright coverage verifies inference, menu navigation, formula synchronization, style retention, one-step Undo, and responsive layout. GitHub Actions and Pages continue to use Rstest and Playwright without installing or invoking A3S Test.

The eighteenth slice replaces the standalone Home and Editing Find button with the Office-style Find and Select menu. Find retains Cmd/Ctrl+F; Go To adds Ctrl+G and F5 for one bounded direct A1 range, quoted cross-sheet references, and worksheet- or workbook-scoped names. The shared dialog reports empty, invalid, ambiguous, hidden, missing, multi-area, unsupported, and out-of-bounds targets before submission. One view-only navigation primitive activates the target sheet, sets the exact range, scrolls to the focused cell, and restores grid focus for Go To and participant following. It emits no controlled onChange, creates no Undo record, and never materializes sparse cells. Command ownership excludes host inputs, formula and cell editing, popovers, and modal controls. Focused resolver, shortcut, controller, ribbon, editor, sparse, and browser regressions protect the workflow. Its deterministic A3S Test ACL is a local release gate; GitHub Actions and Pages continue to use Rstest and Playwright only.

The nineteenth slice adds the Office-style Paste split command to Home and Clipboard. Its primary action pastes All; the disclosure adds quick Values, Formulas, and Formatting actions plus Paste Special. Cmd/Ctrl+Alt+V opens a single dialog with ten content modes, Add, Subtract, Multiply, Divide, Skip blanks, and Transpose. A versioned same-editor clipboard snapshot retains formulas, native styles, comments, validation, explicit protection, hyperlinks, border fragments, complete in-range merges, and column widths. External clipboard content remains rectangular TSV and cannot acquire trusted native formatting. Relative and mixed formula references translate from the source origin to the destination; absolute axes stay fixed. Planning rejects pivot worksheets, partial or conflicting merges, protected or read-only targets, worksheet and XLSX bounds, unsupported external formula state, and divide by zero before mutation. One accepted request updates at most 50,000 destination cells, emits one controlled workbook value, creates one Undo record, selects the pasted range, and restores the current grid after a dialog remount. Focused model, hook, command, shortcut, ribbon, context-menu, dialog, fallback, desktop, and compact regressions cover the contract. The deterministic A3S Test suite remains a local-only release gate and records accessibility, empty console, and empty page-error evidence; Playwright owns bounded visual evidence while the pinned standalone adapter's CDP screenshot command remains unreliable.

The twentieth slice adds Hyperlink to Insert and Links with the grid-scoped Cmd/Ctrl+K shortcut. A single accessible Insert/Edit dialog owns Web page, direct or continuous A1 cell-range, and visible worksheet targets, display-text changes, and explicit Remove. An A3S-owned immutable model writes Fortune's native webpage, cellrange, and sheet records without using the vendor helpers that replace displayed values or hyperlink formatting. Dense data and sparse celldata representation, formulas, values, native formatting, comments, unrelated links, and malformed vendor records remain intact. Apply and Remove each publish one controlled value and one Undo record, preserve the captured selection, and restore the exact ribbon trigger or current grid after a remount. Validation rejects unsafe URLs, malformed or out-of-bounds ranges, missing or hidden worksheets, protected cells, pivot output, and read-only views before mutation. Focused model, command, dialog, editor, ribbon, desktop, and compact regressions cover the workflow. Its deterministic ACL is checked and run locally with A3S Test 1.0.0, agent-browser 0.26.0, and Web protocol 15; GitHub Actions and Pages do not install or invoke A3S Test.

The twenty-first slice adds Data Validation to Data and Data Tools. One accessible dialog snapshots the active worksheet, focused cell, and every live selection, then creates, edits, or removes list, whole-number, decimal, date, and text-length rules. Lists accept bounded comma-separated values, one continuous row or column, and named ranges. Numeric and text-length rules use typed comparison operators; dates accept ISO, integer Excel serial, and DATE(...) boundaries. The browser stores normalized ISO dates for Fortune, XLSX import respects the 1900 or 1904 date system, XLSX export writes stable native formulas, and imported decimal rules no longer reject integers through Fortune's decimal-only vendor type. One accepted Apply or Remove covers at most 10,000 selected cells, rewrites compact dataValidationRanges without materializing blanks, preserves direct or compact records outside the target, publishes one controlled value, creates one Undo record, retains every captured selection, and restores the exact invoker after a remount. Invalid boundaries, two-dimensional list sources, out-of-bounds regions, protection, merges, pivot output, and read-only views fail before mutation. Focused model, XLSX, command, dialog, history, ribbon, desktop, and compact coverage plus a deterministic local A3S Test 1.0.0 ACL protect the workflow; GitHub Actions and Pages do not install or invoke A3S Test.

The follow-up completes common native input and error settings in the same dialog: Ignore blank, in-cell dropdown-arrow visibility, titled input messages, enabled error alerts, Stop/Warning/Information style, and custom error titles and messages. Hidden copy is retained, Unicode-aware 32/255/225 limits are bounded before persistence, and SpreadsheetML's inverted showDropDown is hidden behind the semantic showDropdownArrow field. Compact browser rules now honor blank policy, arrow visibility, and authored input/error copy; all fields round-trip through native XLSX and reopen. Fortune's single blocking browser alert remains the explicit boundary for the distinct Warning and Information confirmation flows. A visible Playground template, publication regression, expanded Playwright workflow, and local-only ACL keep implementation and public documentation synchronized.

The twenty-second slice adds native Spreadsheet Tables/ListObjects through Insert and the grid-scoped Cmd/Ctrl+T shortcut. A single cell expands to its finite current region, an explicit multi-row selection remains exact, and one accessible dialog captures that range plus header semantics. Creation assigns a workbook-unique name, canonicalizes unique headers, rejects empty, out-of-bounds, merged, protected, pivot, overlapping-table, worksheet- AutoFilter, and over-100,000-cell targets, and commits one controlled value and one Undo record. Selecting a table opens a contextual Table Design ribbon with editable names, all 60 OOXML Light/Medium/Dark styles, first/last-column emphasis, row/column stripes, responsive two-dimensional gallery navigation, and exact trigger focus restoration. Table appearance is resolved for visible Canvas cells without mutating controlled cell formats. Convert to Range materializes fills, text emphasis, and borders through a bounded matrix or sparse celldata path before removing the semantic record, and fails closed when a detected structured reference would break. Row/column commands reconcile ranges, column identities, filter offsets, and canonical headers; merge and worksheet AutoFilter operations reject table intersections. Native XLSX table parts, relationships, content types, names, columns, header/totals flags, built-in styles, and supported filters round-trip. Yjs uses parent-scoped creation claims, ID-keyed table records, explicit order, validation, and field-local patches so two clients' independent design edits converge. Focused Rstest, desktop and compact Playwright, and a deterministic local-only A3S Test 1.0.0 ACL protect the slice; GitHub Actions does not install or invoke A3S Test. The follow-up structured-reference slice now shares the bounded Rust/WASM and JavaScript parser, table catalog, dependency graph, and no-history projection path. It resolves table names/display names, worksheet-qualified tables, contiguous columns, #All, #Headers, #Data, #Totals, #This Row, and table-local [@Column] formulas. Each request is capped at 1,024 tables and each structured area at 100,000 cells; disjoint, three-dimensional, external, missing, and over-budget references fail closed. Automatic calculated-column fill on row insertion is now supported for empty cells in new table body rows. The rule is inferred only from one consistent current-row formula, persists in table metadata, and preserves manual values, formulas, styles, and exceptions; conflicts remove the rule. Dense and sparse sheets, Yjs validation, and native XLSX <calculatedColumnFormula> round trips are covered. Common totals-row authoring is now also covered: the Table Design dialog, per-column aggregate/label/custom formula state, filter-aware SUBTOTAL, direct-edit reconciliation, structural movement, rename safety, dense/sparse projections, Yjs validation, and native XLSX totals metadata all have focused evidence. Slicers, external/query tables, and advanced integrations remain open.

The twenty-third slice completes the frequent Traditional Office font-size and border keyboard path under Home and Font. Visible Grow Font and Shrink Font commands share Cmd/Ctrl+Shift+. / Cmd/Ctrl+] and Cmd/Ctrl+Shift+, / Cmd/Ctrl+[ aliases with one typed command. Mixed selections advance each cell independently through the shared 9–72 point scale, treat unformatted blanks as 10 points, compact equal results into native rectangles, and commit one Fortune batch and one Undo record. The 10,000-cell guard rejects oversized live ranges before reading them. Cmd/Ctrl+Shift+& applies a thin black outside border and Cmd/Ctrl+Shift+_ clears selected borders through the existing immutable border command. Ribbon buttons, border-menu kbd hints, and aria-keyshortcuts use the same catalog metadata. Host inputs, formula or cell editing, and modal controls retain their native keys. Focused Rstest, desktop and compact Playwright, and a deterministic local-only A3S Test 1.0.0 ACL protect the slice; GitHub Actions and Pages do not install or invoke A3S Test.

The twenty-fourth slice completes native Spreadsheet underline fidelity. Home and Font now uses an Office-style split control for none, single, double, single-accounting, and double-accounting underline; Format Cells exposes the same typed choices and preserves untouched mixed selections. Cmd/Ctrl+U turns every active variant off and enables single underline from the off state, with one controlled update, one Undo record, and grid-focus restoration. Fortune un values 0–4 remain the only browser state, while native XLSX fonts round-trip exact OOXML u values and SheetJS fallback imports normalize Boolean, numeric, and named variants. Focused Rstest, desktop and compact Playwright, and a deterministic local-only A3S Test 1.0.0 ACL protect the slice with clean console and page-error evidence; GitHub Actions and Pages do not install or invoke A3S Test.

The twenty-fifth slice completes common Traditional Office text orientation and row/column visibility. Home and Alignment exposes Horizontal, both 45-degree angles, stacked Vertical, Rotate Up, and Rotate Down through one keyboard-operated radio menu. Fortune rt stores numeric angles, tr='3' stores stacked text, and XLSX import/export maps OOXML 0–180 plus 255 exactly, including negative angles represented above 90. One orientation intent accepts at most 10,000 cells and remains one native batch, one controlled update, and one Undo record. Rows and Columns adds Hide and Unhide plus grid-scoped Cmd/Ctrl+9, Cmd/Ctrl+0, Cmd/Ctrl+Shift+9, and Cmd/Ctrl+Shift+0; preflight rejects more than 10,000 rows or 1,000 columns before allocating indexes. Host inputs, formula or cell editing, popovers, dialogs, read-only views, and repeated keys retain native behavior. Focused Rstest and XLSX tests, desktop and compact Playwright Canvas pixel evidence, and local A3S Test 1.0.0 semantic regression protect the slice; GitHub Actions and Pages do not install or invoke A3S Test.

The twenty-sixth slice completes common direct-color absence states and Traditional Office font-emphasis aliases. Automatic Color deletes Fortune fc, No Fill deletes bg, and Ctrl+2, Ctrl+3, and Ctrl+4 join Bold, Italic, and Underline through the shared catalog, typed command path, one-step Undo, and final grid focus. Imported direct font, solid-fill, and border colors retain validated theme, indexed, automatic, palette, rendered-RGB, and tint origins through unrelated edits and Yjs transport. XLSX reconstruction emits those semantic references only when the rendered value and non-conflicting palette slot still agree; changed or conflicting values degrade to explicit RGB. Focused Rstest, a real import/edit/export/reopen fixture, desktop and compact Playwright, and a local A3S Test 1.0.0 semantic regression protect the slice. GitHub Actions and Pages do not install or invoke A3S Test.

The twenty-seventh slice preserves independent OOXML diagonal-down and diagonal-up cell-border directions through Ribbon and Format Cells editing, Paste Special, built-in styles, Yjs transport, row insertion, XLSX export, and reopen. A visible-cell Canvas hook paints canonical imported diagonal metadata without densifying the sheet, while a 4,096-cell bound and one indexed read keep each mutation finite. One command remains one native batch, one controlled update, and one Undo record.

The twenty-eighth slice adds static local-date Ctrl+; and minute-precision local-time Ctrl+Shift+; entry through Home and Number. Each command targets only the active cell, preserves unrelated styles, writes the scalar and native number format in one batch, and creates one Undo record. Read-only, inactive, protected, merged, pivot, and invalid targets fail before mutation.

The twenty-ninth slice adds exact copy-from-above semantics. Ctrl+' copies the source formula text without translating relative references and falls back to its scalar when no formula exists. Ctrl+Shift+' copies only the calculated or displayed value and removes the target formula. One native write preserves all target styles, produces one controlled update and one Undo record, and synchronizes the formula bar after success. Formula copying fails closed for external, malformed, array, dynamic-array, data-table, and spill sources; target protection, merge, pivot, bounds, activity, and editability guards apply to both commands. Focused Rstest, desktop and compact Playwright, and the local-only A3S Test 1.0.0 regression verify exact formulas, cached values, style retention, revision counts, focus, accessibility, and clean browser diagnostics without adding A3S Test to GitHub Actions or Pages.

The thirtieth slice completes the common Spreadsheet font-dialog keyboard entry. Cmd/Ctrl+Shift+F and Cmd/Ctrl+Shift+P route through the existing typed Format Cells command and captured selection, open Font, and focus the font-family or font-size combobox respectively. The command catalog remains the single source for editor keys and aria-keyshortcuts; malformed routes fail closed, native host and modal controls remain outside ownership, and Escape returns to the exact grid node. Font previews preserve the requested text color while selecting a dark or light neutral canvas from relative luminance so light fonts stay visible. Focused Rstest, desktop and compact Playwright, and the local-only A3S Test 1.0.0 regression protect routing, focus, accessibility, contrast, and empty browser diagnostics without changing Actions.

The thirty-first slice preserves native XLSX rich-text cells from shared and inline strings through import, cell-wide formatting, export, and reopen. Fortune's existing ct.s runs retain font family, size, color, bold, italic, strikethrough, four underline variants, and exact edge whitespace. Matching theme, indexed, automatic, and tint identities remain semantic; changed colors export as RGB. One Format Cells intent immutably updates every run while retaining the inline-string type, one controlled revision, and one Undo record. Fail-closed budgets cap a cell at 32,767 characters and 512 runs, and an import at 10,000 rich-text cells and 100,000 materialized runs. Focused Rstest, import/export/reopen fixtures, desktop and compact Playwright, and the local-only A3S Test 1.0.0 regression cover fidelity, focus, accessibility, and clean diagnostics. At that slice, caret-level partial-run authoring remained explicit future work.

The thirty-second slice closes the common partial-run formatting gap. A non-collapsed selection in the live cell editor or formula bar routes font family, size, color, bold, italic, strikethrough, and underline through one bounded model before the whole-cell command path. Plain strings become native inline-string runs only after a valid command; existing runs split and coalesce without changing untouched text or matching semantic color origins. Direct ribbon actions restore the selected text while the editor remains active. Malformed coordinates, invalid values, formula cells, UTF-16 surrogate splits, and results beyond 32,767 characters or 512 runs fail closed. Rich-text insertion and editing outside these font attributes remain future work.

The thirty-third slice closes direct native rich-text insertion and deletion through the formula bar and F2 in-cell editor. A pure bounded reconciliation model derives one contiguous replacement from the previous controlled text, inherits the replaced or immediately preceding run for inserted characters, and preserves unaffected run boundaries, font styles, and theme, indexed, automatic, or tint color identities. Authenticated incremental cell operations project only exact coordinates. A non-structural callback without a cell operation may restore source runs only when its text is exactly unchanged; structural batches never infer by old coordinates. Formula-bar and F2 commits publish one controlled revision and one Undo record, while text-stable focus callbacks publish no revision. UTF-16 validity, 32,767-character, and 512-run bounds remain fail closed. Formatted paste and simultaneous disjoint edits remained open work at that slice.

The thirty-fourth slice closes common formatted rich-text paste in the formula bar and F2 editor. A paste event stages one bounded authority over the exact worksheet object, cell coordinate, controlled source text, UTF-16 selection, plain clipboard text, and sanitized font runs. Incremental and compatibility projection may consume it only when an authenticated cell operation emits the predicted replacement. Untouched source runs retain boundaries and semantic theme, indexed, automatic, or tint colors; pasted font family, size, explicit RGB, bold, italic, strikethrough, and underline apply only inside the inserted range. Eligible plain and empty cells become native inline strings. HTML is discarded after parsing and capped at 256,000 characters; cell text and result runs retain the 32,767/512 limits. Mismatch, malformed input, structural operations, and invalid UTF-16 fail closed to inherited or plain text rather than authorizing clipboard styles. One commit remains one controlled revision and one Undo record. Focused Rstest, registered and fallback projection tests, desktop and compact real-clipboard Playwright, and four local-only A3S Test 1.0.0 scenarios cover the path with clean diagnostics. Simultaneous disjoint edits and non-font inline objects remain open work.

The thirty-fifth slice preserves all 17 native non-solid OOXML pattern fills. A dedicated cell field carries the exact pattern type, rendered foreground and background colors, and validated theme, indexed, automatic, or tint origins; Fortune bg remains the background projection and invalidates stale metadata after an explicit color change. A visible-cell Canvas hook paints the base and procedural overlay behind text, with conditional and table fills taking precedence and no hidden-cell raster work. Format Painter, Paste Special Formats, unrelated formatting, Yjs transport, export, and reopen preserve the field. New Fill, No Fill, Clear Formats, and built-in Cell Styles remove it. Malformed colors fail closed, and semantic palette conflicts export literal RGB. Focused Rstest, desktop/compact Canvas pixel evidence, and the local-only A3S Test 1.0.0 gallery gate cover every pattern identity with clean browser diagnostics; GitHub Actions and Pages do not install or invoke A3S Test.

The thirty-sixth slice preserves native OOXML linear and path gradient fills. A dedicated cell field keeps exact finite linear angles or validated 0–1 path inner-rectangle edges, plus two through 256 non-descending stops with rendered colors and optional theme, indexed, automatic, or tint origins. Fortune bg projects the first stop and invalidates stale metadata after an explicit color change. A shared visible-cell Canvas interceptor renders native linear gradients or at most 96 nested rectangular path contours behind text; conditional and table fills remain authoritative and hidden cells do no work. Format Painter, Paste Special Formats, unrelated formatting, Yjs transport, export, and reopen preserve the field. Explicit fills, No Fill, Clear Formats, and built-in Cell Styles clear both native-fill metadata families. Unknown types, malformed colors, descending or out-of-range stops, invalid geometry, ambiguous XML, and excessive stop counts fail closed. Prepared-palette conflicts emit literal RGB instead of false semantic references. Focused Rstest, desktop/compact Canvas pixel evidence, and a local-only A3S Test 1.0.0 gallery gate cover the path without adding A3S Test to Actions or Pages.

The thirty-seventh slice adds native fill authoring to the shared Format Cells dialog. One typed union covers None, Solid, all 17 Pattern choices, and Linear or Path Gradient. Pattern colors, exact gradient geometry, and two through 256 ordered stops are editable with the production Canvas preview; midpoint stop insertion interpolates neighboring colors. Mode switches retain inactive drafts, mixed selections require an explicit edit, and invalid stop order or path geometry blocks Apply. One Apply remains one controlled update and one Undo record, while authored pattern and gradient records survive XLSX export and reopen. Focused Rstest, desktop/compact Playwright, and local-only A3S Test 1.0.0 cover edit, Apply, reopen, Undo, containment, accessibility, and clean browser diagnostics without adding A3S Test to Actions or Pages.

The thirty-eighth Spreadsheet slice adds offline multi-key Custom Sort through one dedicated editor extension. The accessible dialog freezes a continuous range, exposes an editable header decision, and adds, removes, or reprioritizes up to 64 unique ascending or descending value keys. Stable numeric and natural text ordering keeps blanks last; complete cell rows move in one native batch, relative formula rows translate, and one Undo restores the source. Merges, protection, pivots, malformed or oversized matrices, structural tables, worksheet AutoFilter, and coordinate-owned hyperlink, imported-formula, or border sidecars fail closed before mutation. Focused Rstest, desktop/compact Playwright, and local-only A3S Test 1.0.0 cover priority changes, formula movement, Undo, focus, accessibility, and clean browser diagnostics without adding A3S Test to Actions or Pages.

The thirty-ninth Spreadsheet slice adds the Traditional Office Sort Warning for partial, narrow-column, and single-cell selections. Sort and AutoFilter share one dense/sparse current-region model; exact and expanded candidates run through independent protection, merge, pivot, table, AutoFilter, coordinate-sidecar, row-count, and area guards. Expand is the accessible default, while an exact single cell remains disabled. Both quick and Custom Sort authenticate the frozen destination against the original live selection, so selection changes fail before mutation. Deep browser testing also exposed and fixed formatted formula results being misclassified as headers. Focused Rstest, desktop/compact Playwright, and local-only A3S Test 1.0.0 cover range choice, quick/custom transitions, formula movement, Undo, focus, accessibility, and clean browser diagnostics without adding A3S Test to Actions or Pages.

The fortieth Spreadsheet slice adds offline custom-list order to every sort key. One bounded model owns seven immutable Chinese/English month and weekday sequences, newline/comma parsing, Unicode normalization, duplicate detection, and limits of 256 entries, 128 code points per entry, and 4,096 total code points. Listed values sort before unmatched natural-order values, blanks remain last, and stable equal ranks can continue through later keys. The dialog retains at most 32 user sequences only for the mounted editor session; requests clone their sequence and controlled workbook content remains untouched. The typed host-store boundary arrives in the forty-fourth slice below. Focused Rstest, desktop/compact Playwright, and the local-only pinned A3S Test 1.0.0 gate cover invalid input, reuse, formula movement, one-step Undo, accessibility, and clean diagnostics without adding A3S Test to Actions or Pages.

The forty-first Spreadsheet slice adds offline appearance order to every sort key. A typed Sort On union covers values, custom lists, effective cell color, effective font color, and conditional-format icons; appearance targets can be placed at the top or bottom and repeated levels express a complete visual priority. A separate bounded model combines direct native styles with calculated conditional-format output, preserves no-fill and automatic-font identities, and does not flatten native gradients or patterns into false solid colors. The command rebuilds the effective snapshot from controlled sheet state and the live range before reusing the formula-safe row batch and one-step Undo. Focused Rstest, desktop/compact Playwright, and the local-only pinned A3S Test 1.0.0 gate cover four-level same-column color/font/icon priority, formula movement, Undo, focus, responsive containment, accessibility, and clean diagnostics without adding A3S Test to Actions or Pages.

The forty-second Spreadsheet slice adds Traditional Office-compatible left-to-right Custom Sort. A nested options dialog changes the key axis without duplicating the main editor, disables header retention for horizontal movement, and maps appearance placement from top/bottom to left/right. One direction-neutral matrix model stably reorders complete rows or columns, translates relative formulas only along the moved axis, preserves absolute references, and rejects any out-of-range translation before the single native write and Undo record. Focused Rstest, desktop/compact Playwright, and the local-only pinned A3S Test 1.0.0 gate cover multi-row priority, horizontal appearance order, formula movement, atomic failure, Undo, focus, responsive containment, accessibility, and clean diagnostics without adding A3S Test to Actions or Pages.

The forty-third Spreadsheet slice completes common offline text comparison in Sort Options. One typed collation model normalizes pinyin/stroke and case sensitivity, compiles one local Simplified Chinese comparator per request, keeps numeric text lexical while real numbers remain numeric, behavior-probes the requested order across runtime label aliases, and rejects an unsupported collation before mutation. Both row and column movement reuse the same stable comparator. Deep browser repetition also exposed and fixed a controlled-remount race by enrolling directly focused grid overlays in the existing bounded focus handoff. Focused Rstest, desktop/compact repeated Playwright, and the local-only pinned A3S Test 1.0.0 gate cover both Chinese orders, lowercase ties, formulas, Undo, immediate keyboard focus, accessibility, and clean diagnostics without adding A3S Test to Actions or Pages.

The forty-fourth Spreadsheet slice makes authored custom sort lists reusable through an explicit typed host store. The React, Vue, and Web Component adapters accept one SpreadsheetSortCustomListStore; the provided local-storage implementation uses an injected backend, a versioned payload, canonical validation, deduplication, and the same 32-list bound as the dialog. Missing stores preserve mounted-session behavior, corrupt reads fail closed, rejected writes keep the new list in session with a visible error, and controlled workbook content never owns a preference. Focused Rstest, desktop/compact Playwright, and the local-only pinned A3S Test 1.0.0 gate cover storage round trips, full-page reload reuse, formula-safe sorting, one-step Undo, accessibility, and clean diagnostics without adding A3S Test to Actions or Pages.

The forty-fifth Spreadsheet slice adds common worksheet AutoFilter conditions through an A3S-owned accessible dialog and typed command extension. Equal, not-equal, contains, does-not-contain, begins/ends-with, numeric comparisons and ranges, blanks, and nonblanks share one dense/sparse evaluator. Each active column owns its hidden rows, their union drives display, and an explicit overlap record preserves manually hidden rows across condition replacement, clearing, filter removal, and Undo. Commands reauthenticate the editable active sheet, exact filter range, and target column before one controlled update; the frozen selection survives the Fortune remount. Native worksheet criteria reuse the table filter union and round-trip through XLSX. Unsafe vendor sort actions are removed from the header menu so only the formula-safe typed sort path remains. Focused Rstest, desktop/compact Playwright, and the local-only pinned A3S Test 1.0.0 gate cover multi-column ownership, manual overlap, XLSX reopen, Undo, focus, accessibility, and clean diagnostics without adding A3S Test to Actions or Pages. The following slices complete same-column AND/OR, wildcard, Top/Bottom, dynamic evaluation, and table/AutoFilter-owned Custom Sort.

The forty-sixth Spreadsheet slice adds exactly two same-column Custom AutoFilter conditions joined by AND or OR. A fixed nonrecursive tuple extends the closed filter model, collaboration validator, command reauthorization, dense/sparse evaluator, and shared worksheet/table OOXML path. The accessible dialog can add or remove the second condition, restores controlled/imported pairs, validates both operands, and adds negative prefix and suffix operators. General native <customFilters and="1|0"> pairs round-trip without collapsing their relation, while canonical between/not-between forms remain stable. Focused Rstest, desktop/compact Playwright, and the local-only pinned A3S Test 1.0.0 gate cover AND/OR semantics, malformed nesting, responsive containment, XLSX reopen, Undo, accessibility, and clean diagnostics without adding A3S Test to Actions or Pages. The following slices complete wildcard, Top/Bottom, dynamic evaluation, and table/AutoFilter-owned Custom Sort.

The forty-seventh Spreadsheet slice completes local Top/Bottom AutoFilter authoring and evaluation. Numeric-column menus expose an owned Top 10 Items action with a bounded ten-item default; the shared dialog authors top or bottom 1–500 items and 1–100 percent with integer validation. The dense/sparse model computes one numeric threshold, rounds percentage counts upward, preserves all boundary ties, and excludes text, Boolean, blank, and nonfinite cells. Command reauthorization, manual-hide and multi-column ownership, worksheet/table native <top10> round trips, and imported-workbook recomputation use the same closed criteria union. Focused Rstest, desktop/compact Playwright, and the local-only pinned A3S Test 1.0.0 gate cover the numeric-only menu entry, default/edit flow, application, Undo, accessibility, XLSX reopen, and clean diagnostics. Later slices complete wildcard, dynamic evaluation, and table/AutoFilter-owned Custom Sort; large-rank Worker/WASM offload remains open.

The forty-eighth Spreadsheet slice completes local wildcard AutoFilter authoring and evaluation. Two explicit nonrecursive custom-condition variants preserve arbitrary *, ?, and ~ expressions while existing equality and text operands retain literal semantics. A controlled token compiler normalizes Unicode text, handles zero-or-more, single-character, and escaped operators, and applies the shared 32,767-character filter operand ceiling. The variants remain valid in either position of the fixed AND/OR pair and pass through the same command and collaboration reauthorization boundaries.

Worksheet and table OOXML retain arbitrary positive and negative <customFilter> values; canonical edge-star patterns still normalize to the narrower contains, begins-with, or ends-with criteria. Focused model, compiler, command, dialog, Hook, collaboration, and XLSX Rstest plus desktop/compact Playwright and the local-only pinned A3S Test 1.0.0 gate cover Unicode, escaping, compound authoring, import/reopen, Undo, accessibility, and clean diagnostics. The following slices complete dynamic evaluation and table/AutoFilter-owned Custom Sort; large-rank Worker/WASM offload remains open.

The forty-ninth Spreadsheet slice completes local dynamic AutoFilter authoring and evaluation for the closed native family. Numeric columns expose strict above/below-average conditions; typed date columns expose relative day, week, month, quarter, and year ranges, Year to Date, calendar quarters 1–4, and calendar months 1–12 without an operand. A pure compiler receives an explicit clock, uses Sunday-start inclusive/exclusive ranges, streams aggregate input without retaining the column, recovers imported SheetJS dates across time zones, and never treats an unformatted number as a date. Command reauthorization, dense/sparse row ownership, manual-hide preservation, worksheet/table <dynamicFilter> round trips, and imported-workbook recomputation share the existing closed criterion union. Focused Rstest runs in UTC, Asia/Shanghai, and America/Los_Angeles; desktop/compact Playwright and the local-only pinned A3S Test 1.0.0 gate cover authoring, application, Undo, accessibility, and clean diagnostics. Large aggregate/rank Worker/WASM offload remains open; the fifty-first slice below completes table/AutoFilter-owned Custom Sort and the fifty-second completes source-level 1904 retention.

The fiftieth Spreadsheet slice completes bounded custom-list preference management inside Custom Sort. One responsive, keyboard-accessible dialog keeps the seven built-in sequences read-only and stages creation, editing, deletion, and reordering for at most 32 user lists before one atomic confirmation. Duplicate and size validation reuse the canonical list model; unchanged confirmation does not write the typed store; cancellation discards the draft; and a rejected write preserves the complete changed set for the mounted session with visible feedback. Active sort keys follow edited sequences and return to ascending value order when their sequence is deleted. Focused Rstest and desktop/compact Playwright cover bounds, persistence order, remounts, responsive containment, focus restoration, accessibility, and clean diagnostics.

The fifty-first Spreadsheet slice integrates Custom Sort with native table and worksheet AutoFilter ownership. Any contained selection resolves to the exact sortable owner; table totals are excluded, structural headers remain fixed, and left-to-right movement is disabled. The request carries an owner fingerprint that is derived again immediately before mutation, so table replacement, header/totals changes, and moved filters fail closed. Filter-active sorts emit one controlled workbook change: typed worksheet/table conditions are evaluated against the sorted dense or sparse cells, opaque Fortune value/color filters remap hidden-row ownership through the stable sort permutation, and independent manual hiding remains intact. Missing hidden rows from the native range reader fall back to controlled cells, while sort area and filter rescans stay under explicit one-million-cell budgets. Focused Rstest, a local-only A3S Test gate, and desktop/compact Playwright cover table formulas, native filter visibility, single-step Undo, focus, responsive containment, accessibility, and clean diagnostics.

The fifty-second Spreadsheet slice makes the workbook date system an explicit controlled-model field. XLSX import retains the native 1900 or 1904 epoch and exact date-typed numeric serials; export restores workbookPr date1904 and numeric formula caches without a JavaScript Date conversion. Dynamic date filters, menu profiling, post-edit and post-sort reconciliation, and Ctrl+; authoring consume the same epoch. Collaboration validates and merges the field independently from calculation settings. Focused unit, real-package reopen, and local A3S Test browser coverage verify 1904 serial zero, filter ownership, controlled reopen, accessibility, and clean diagnostics.

Continue replacing remaining vendor-specific dense paths with the A3S-owned sparse traversal contract and virtualized viewport.
Expand Worker/WASM formula parity, dependency tracking, number formats, advanced sorting and filter predicates, validation, charts, pivots, and print layout.
Keep lightweight selection statistics responsive for dense and sparse sheets.
Expand the native format engine from the common preset set into host-selected currencies, locale-aware dates, custom conditional sections, and explicit unsupported-format diagnostics without rewriting imported codes.
Keep font family, vertical alignment, and text wrapping available from the primary ribbon and backed by the native workbook cell-style model.
Keep worksheet lifecycle actions in the shared Office interaction system: destructive deletion uses a safe default, invalid names remain editable with local accessible feedback, and temporary menus and dialogs restore focus.
Keep phone worksheet renaming focused on the active task: unrelated footer tools yield the available width, invalid feedback expands into a readable second row, and successful or cancelled edits restore the normal workbook status controls without covering the grid.
Keep workbook task panes as bounded desktop regions and focus-contained phone dialogs. At phone widths the ribbon, grid, and worksheet footer remain inert; Tab and Shift+Tab stay in the pane; Escape cancels a dirty draft before it closes the pane and restores the exact ribbon invoker. Deterministic browser evidence covers the modal semantics, focus order, isolation, screenshot, accessibility tree, console, and page errors.
Preserve direct type-to-edit after focus recovery and keep multi-cell paste, selection, copy, and undo coherent when React replays vendor state updates.
Preserve XLSX relationships, names, styles, formulas, comments, charts, images, and unsupported package state.

Exit evidence: render cost depends on the viewport, recalculation depends on the dirty dependency graph, and the compatibility fixture matrix passes in Excel and Traditional Office.

Priority 4: Presentation

Complete masters, layouts, themes, placeholders, groups, tables, charts, links, notes, comments, transitions, and presenter workflows.
Keep exact row and column table insertion behind the shared, keyboard- accessible Office table picker and one controlled history record.
Keep scene object identity stable through selection, transforms, clipboard, history, import, and export.
Keep native slide and object context actions available independently of optional AI integrations.
Keep the chart inspector as a bounded desktop region and a focus-contained dialog whenever the responsive layout overlays the canvas. The ribbon, workspace, and status bar remain inert; Tab and Shift+Tab stay inside; Escape cancels a dirty field before closing; and close restores the selected chart. Deterministic phone evidence covers semantics, focus order, isolation, screenshot, accessibility tree, console, and page errors.
Keep comment review as a docked desktop strip and a full-editor modal on phones. The compact surface uses readable review text and 44 px primary actions, isolates the ribbon, workspace, and status bar, contains Tab and Shift+Tab, lets a dirty comment consume Escape before the panel closes, and restores the exact New Comment, View Comments, or comment-marker invoker. Deterministic phone evidence covers both invoker paths, modal semantics, focus order, isolation, screenshot, accessibility tree, console, and page errors.
Keep F5 and Shift+F5 as direct slideshow paths with an in-page fallback when the browser denies fullscreen.
Keep the bounded entrance/exit animation model composable across the object- centric ribbon, controlled history, clipboard, collaboration, slideshow, reduced motion, and native PPTX timing-tree reopen. Reject duplicate classes, overlapping same-object cue intervals, inconsistent transitions, and untrusted timing structures before they enter editable state.
Move bounded geometry, text fitting, connector routing, snapping, and thumbnail work behind Worker/WASM contracts.

Exit evidence: complex slides stay interactive, supported objects preserve their semantics through PowerPoint and Traditional Office round trips, and one gesture creates one controlled update.

Priority 5: PDF

Keep color, opacity, and compatible stroke-width controls routed through typed annotation capabilities for both tool defaults and selected objects.
Retain the completed first page-organization slice: insert, delete, rotate, reorder, extract, merge, and split run in a dedicated Worker; every mutation replaces one Blob and creates one Undo record; native history is consumed first; and 256 MiB primary, 128 MiB merge, and 4,096-page limits fail closed.
Add form authoring, signatures, document-level catalog rewriting, and explicit redaction review while preserving the implemented search, history, save, and page-organization paths.
Keep navigation, zoom, and history reachable from the responsive overflow menu whenever the primary toolbar hides those controls.
Retain the implemented active-page thumbnail synchronization, bounded long-document thumbnail window, and focus-contained phone page drawer. Its toolbar-owned trigger must never cover rendered PDF content.
Keep PDFium lifecycle, page bitmap cache, and source Blob ownership bounded.
Verify saved annotations, forms, and page mutations by reopening the emitted Blob in PDFium and an independent binary parser. Keep signed, encrypted, and unsafe catalog structures inside the documented fail-closed boundary.

Exit evidence: large files render a bounded page window, page exports retain their declared count/order/rotation, edits survive reopen, and destructive operations always show a review step before save.

Public Extension Plan

The public Extension surface grows only when its context can remain stable across minor releases.

Available now

DocumentEditor.extensions: additional TipTap Extensions.
MarkdownEditor.extensions: additional TipTap Extensions.
DocumentEditor.getSelectionMenuItems: a host-owned selected-text menu factory with full document snapshots and conflict-aware text-edit commands.
MarkdownEditor.getSelectionMenuItems: the same host-owned boundary across source and visual selections, with complete Markdown context and safe edits.
Both editors append host Extensions after built-ins and throw on duplicate names.
Vue accepts :extensions; custom elements accept the .extensions property.

Structural TipTap Extensions own a persistence obligation. Document Nodes and Marks need DOCX import/export handling. Markdown Nodes and Marks need Markdown parse/serialize rules. An Extension that only adds shortcuts, storage, or a ProseMirror Plugin does not change the persisted content schema and is the recommended first integration.

Stable host extension points

Document and Spreadsheet: fileActions and onAgentRequest.
Presentation: fileActions, onAgentRequest, and onStartSlideshow.
PDF: loadSource, onSave, and onPageExport.

Spreadsheet, Presentation, and PDF command contexts remain internal until each has a typed, versioned Extension context, deterministic command ordering, capability discovery, cleanup semantics, and compatibility tests. Consumers must not import internal modules.

Playground Documentation Definition of Done

The Playground integration guide is the public API reference for a release. For each editor it must include:

Every public Prop with its exact type, required state, default value, framework binding, and behavioral description.
React callbacks, Vue events, and Web Component events or properties.
The canonical content model or, for PDF, the Blob load/save lifecycle.
Supported Extensions, collision behavior, lifecycle guidance, persistence requirements, and a copyable highlighted example.
Document and Markdown selection-menu snapshots, async target lifetime, stale-selection behavior, editing commands, and React/Vue/Web Component bindings.
Explicit alternatives when an internal Extension API is not public.
Links or examples for React, Vue, and Web Components.

The guide is tested as product code. Navigation, all five editor tabs, Props tables, content contracts, Extension examples, code highlighting, horizontal table scrolling, and compact layout must pass before release. A public API change is incomplete until the corresponding guide and tests change in the same pull request.

Execution Order

Keep the shared quality gates green while finishing the current Word vertical slice.
Close that slice with unit, interaction, visual, performance, and Word/Traditional Office round-trip evidence.
Update public types and Playground documentation only after the contract is stable.
Move to the next Word slice. Do not start a lower-priority editor milestone merely because its UI is easier to demonstrate.
Revisit the priority order only with measured user demand, compatibility risk, and engineering evidence.

#Editor Quality Roadmap

#Shared controlled IME integrity

#Product Principles

#Release Gates Shared by Every Editor

#Priority 1: Word-Compatible Document Editing

#1. DOCX Round-Trip Foundation

#2. Deterministic Pagination and Text Layout

#3. Styles, Lists, and Tables

#4. Media, Fields, and Page Objects

#5. Review and Long-Document Quality

#Priority 2: Markdown

#Priority 3: Spreadsheet

#Priority 4: Presentation

#Priority 5: PDF

#Public Extension Plan

#Available now

#Stable host extension points

#Playground Documentation Definition of Done

#Execution Order

Editor Quality Roadmap

Shared controlled IME integrity

Product Principles

Release Gates Shared by Every Editor

Priority 1: Word-Compatible Document Editing

1. DOCX Round-Trip Foundation

2. Deterministic Pagination and Text Layout

3. Styles, Lists, and Tables

4. Media, Fields, and Page Objects

5. Review and Long-Document Quality

Priority 2: Markdown

Priority 3: Spreadsheet

Priority 4: Presentation

Priority 5: PDF

Public Extension Plan

Available now

Stable host extension points

Playground Documentation Definition of Done

Execution Order